Version 4 SHEET 1 3920 3748 WIRE 80 208 64 208 WIRE 64 240 64 208 WIRE 64 336 64 320 WIRE -752 496 -752 448 WIRE -752 496 -800 496 WIRE -688 496 -752 496 WIRE -576 496 -608 496 WIRE -96 496 -576 496 WIRE 0 512 -16 512 WIRE 112 512 64 512 WIRE -800 528 -800 496 WIRE -752 528 -752 496 WIRE 112 528 112 512 WIRE -96 544 -96 496 WIRE 288 592 288 512 WIRE -16 608 -16 512 WIRE -800 624 -800 592 WIRE -576 624 -576 496 WIRE 112 640 112 608 WIRE 176 640 112 640 WIRE 224 640 176 640 WIRE -432 656 -432 640 WIRE -208 656 -208 544 WIRE -96 656 -96 544 WIRE -16 688 -16 672 WIRE 112 688 112 640 WIRE 176 704 176 640 WIRE 288 704 288 688 WIRE 336 704 288 704 WIRE 384 704 336 704 WIRE 416 704 384 704 WIRE 384 736 384 704 WIRE 336 752 336 704 WIRE -752 768 -752 592 WIRE -576 768 -576 704 WIRE -576 768 -752 768 WIRE -544 768 -576 768 WIRE -432 768 -432 720 WIRE -432 768 -464 768 WIRE -208 768 -208 656 WIRE -96 768 -96 656 WIRE -16 768 -96 768 WIRE -752 800 -752 768 WIRE 112 800 112 752 WIRE 176 800 176 768 WIRE -432 816 -432 768 WIRE 336 848 336 816 WIRE 384 848 384 816 WIRE -208 880 -208 768 WIRE -96 880 -96 768 WIRE -752 928 -752 864 FLAG -752 448 ANT IOPIN -752 448 BiDir FLAG 64 336 0 FLAG 80 208 VCC FLAG -752 928 0 FLAG -800 624 0 FLAG 416 704 OUT IOPIN 416 704 Out FLAG 112 800 0 FLAG 336 848 0 FLAG 384 848 0 FLAG 288 512 VCC FLAG 176 800 0 FLAG -432 880 0 FLAG -432 640 VCC SYMBOL cap -768 528 R0 SYMATTR InstName C1 SYMATTR Value 33p SYMBOL res -560 608 M0 SYMATTR InstName R1 SYMATTR Value 47k SYMBOL voltage 64 224 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value {VCC} SYMBOL ind -704 512 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 330µ SYMATTR SpiceLine Rser=16 Rpar=5meg Cpar=1p SYMBOL cap -768 800 R0 SYMATTR InstName C2 SYMATTR Value 470p IC=2.5 SYMBOL cap -784 528 M0 SYMATTR InstName C3 SYMATTR Value {CC} SYMBOL res -448 752 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL 74hc14 -272 720 R0 SYMATTR InstName U2 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL 74hc14 -160 832 R0 SYMATTR InstName U3 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL 74hc14 -160 720 R0 SYMATTR InstName U4 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL 74hc14 -160 608 R0 SYMATTR InstName U5 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL 74hc14 -160 496 R0 WINDOW 0 -16 16 Left 2 WINDOW 3 -32 80 Left 2 SYMATTR InstName U6 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL ind 96 512 R0 SYMATTR InstName L4 SYMATTR Value 330µ SYMATTR SpiceLine Rser=16 Rpar=5meg Cpar=1p SYMBOL cap 64 496 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C10 SYMATTR Value 33p SYMBOL cap 320 752 R0 WINDOW 0 -36 30 Left 2 WINDOW 3 -48 56 Left 2 SYMATTR InstName C11 SYMATTR Value 10n SYMBOL res 368 720 R0 WINDOW 3 34 96 Left 2 SYMATTR Value 2.2Meg SYMATTR InstName R7 SYMBOL cap 128 688 M0 WINDOW 0 48 33 Left 2 SYMATTR InstName C12 SYMATTR Value 470p SYMBOL diode 160 768 M180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D4 SYMATTR Value 1N4148 SYMBOL npn 224 592 R0 SYMATTR InstName Q3 SYMATTR Value BC547C SYMBOL cap -32 672 M180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C4 SYMATTR Value 330p SYMBOL res -32 672 R0 SYMATTR InstName R3 SYMATTR Value 150 SYMBOL 74hc14 -384 720 R0 SYMATTR InstName U1 SYMATTR SpiceLine VCC={VCC} SPEED=1.0 TRIPDT=1e-9 SYMBOL diode -416 720 R180 WINDOW 0 24 64 Left 2 WINDOW 3 44 29 Left 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode -416 880 R180 WINDOW 0 24 64 Left 2 WINDOW 3 44 34 Left 0 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT -56 1000 Left 2 !.tran 0 100u 0 10n TEXT -616 104 Left 4 ;74HC14 Theremin w. CV out TEXT 112 280 Left 2 !.param VCC=5 TEXT -152 1088 Left 2 !.options plotwinsize=0 TEXT -680 552 Left 2 ;16R TEXT -848 656 Left 2 ;C_hand TEXT -672 432 Left 2 ;Panasonic ELJFB331KF TEXT -608 160 Left 2 ;Fres @ C_hand 1f : 1.53MHz TEXT -608 200 Left 2 ;Fres @C_hand 1p : 1.50MHz TEXT -592 240 Left 2 ;=> sensivity 30kHz/pF TEXT -72 1040 Left 2 !.inc 74HC_v.lib TEXT -616 312 Left 2 ;V(ANT): 400Vpp@ VCC 5V TEXT -632 1096 Left 2 !.step param CC list 1p 2p 3p TEXT -608 1064 Left 2 !.param CC 1p TEXT -608 944 Left 2 ;6x HC14 parallel does not work in reality\ndue to switching level tolerances (outputs short each other) TEXT 408 664 Left 2 ;to VCA TEXT 48 104 Left 2 ;CC NC BY SA elektrouwe 01/2023 TEXT -16 432 Left 2 ;Panasonic ELJFB331KF TEXT 104 496 Left 2 ;16R